Submission #584950

#	Time	Username	Problem	Language	Result	Execution time	Memory
584950		rxlfd314	Wall (IOI14_wall)	C++17	0 / 100	1 ms	212 KiB

wall

#include "wall.h"
#include <bits/stdc++.h>
using namespace std;
constexpr int mxn = 2e6 + 5, inf = 0x3f3f3f3f;
int n, _1[mxn * 4], _2[mxn * 4];
void apply(int i, int v1, int v2) {
   _1[i] = max(v1, min(_1[i], v2));
   _2[i] = min(v2, max(_1[i], v1));
}
void push(int i) {
   apply(2 * i, _1[i], _2[i]);
   apply(2 * i + 1, _1[i], _2[i]);
   _1[i] = inf;
   _2[i] = 0;
}
void upd(int ql, int qr, int v1, int v2, int i = 1, int tl = 0, int tr = n - 1) {
   if (ql > tr || qr < tl) return;
   if (ql <= tl && tr <= qr) {
      apply(i, v1, v2);
      return;
   }
   push(i);
   int mid = tl + tr >> 1;
   upd(ql, qr, v1, v2, 2 * i, tl, mid);
   upd(ql, qr, v1, v2, 2 * i + 1, mid + 1, tr);
}
void fillans(int *ans, int i = 1, int tl = 0, int tr = n - 1) {
   if (tl == tr) {
      ans[tl] = min(_1[i], _2[i]);
      return;
   }
   push(i);
   int mid = tl + tr >> 1;
   fillans(ans, 2 * i, tl, mid);
   fillans(ans, 2 * i + 1, mid + 1, tr);
}
void buildWall(int len, int k, int *op, int *left, int *right, int *height, int *ans) {
   n = len;
   for (int i = 0; i < k; i++) {
      upd(left[i], right[i], op[i] == 1 ? height[i] : inf, op[i] == 2 ? height[i] : 0);
   }
   fillans(ans);
}

Compilation message (stderr)

wall.cpp: In function 'void upd(int, int, int, int, int, int, int)':
wall.cpp:23:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |    int mid = tl + tr >> 1;
      |              ~~~^~~~
wall.cpp: In function 'void fillans(int*, int, int, int)':
wall.cpp:33:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 |    int mid = tl + tr >> 1;
      |              ~~~^~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 24
• Subtask 3: 0 / 29
• Subtask 4: 0 / 39